The phrase identifies attire inspired by characters from the Lego Ninjago franchise, intended for wear on or around October 31st. Examples include outfits replicating the appearances of Kai, Jay, Zane, Cole, and Lloyd, often constructed from fabric and accessories to mimic the angular, blocky aesthetic of Lego figures.
Such character-based ensembles provide children with an opportunity for creative expression and imaginative play during seasonal festivities. This specific theme leverages the established popularity of a well-known media property, offering readily recognizable and desirable options for individuals seeking to embody heroic figures. The concept builds upon a history of licensed character costuming and the continued market relevance of the Lego brand.